U.S. patent number 9,541,745 [Application Number 14/526,528] was granted by the patent office on 2017-01-10 for optical imaging lens and electronic device comprising the same.
This patent grant is currently assigned to Genius Electronic Optical Co., Ltd.. The grantee listed for this patent is Feng Chen, Shih-Han Chen, Jinhui Gong. Invention is credited to Feng Chen, Shih-Han Chen, Jinhui Gong.
United States Patent |
9,541,745 |
Chen , et al. |
January 10, 2017 |
Optical imaging lens and electronic device comprising the same
Abstract
An optical imaging lens includes: a first, second, third, fourth
and fifth lens element, the first lens element has an object-side
surface with a convex part in a vicinity of the optical axis and a
convex part in a vicinity of its periphery; the second lens element
has an object-side surface with a convex part in a vicinity of its
periphery; the third lens element has positive refractive power,
having an object-side surface with a concave part in a vicinity of
its periphery; the fourth lens element has positive refractive
power, having an object-side surface with a concave part in a
vicinity of its periphery and an image-side surface with a convex
part in a vicinity of the optical axis; the fifth lens element has
an image-side surface with a concave part in a vicinity of the
optical axis and a convex part in a vicinity of its periphery.
Inventors: |
Chen; Shih-Han (Taichung,
TW), Chen; Feng (Taichung, TW), Gong;
Jinhui (Taichung, TW) |
Applicant: |
Name |
City |
State |
Country |
Type |
Chen; Shih-Han
Chen; Feng
Gong; Jinhui |
Taichung
Taichung
Taichung |
N/A
N/A
N/A |
TW
TW
TW |
|
|
Assignee: |
Genius Electronic Optical Co.,
Ltd. (Taichung, TW)
|
Family
ID: |
51851782 |
Appl.
No.: |
14/526,528 |
Filed: |
October 29, 2014 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20150301308 A1 |
Oct 22, 2015 |
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Foreign Application Priority Data
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Apr 16, 2014 [CN] |
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2014 1 0153384 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
G02B
9/60 (20130101); G02B 13/0045 (20130101); G02B
13/18 (20130101) |
Current International
Class: |
G02B
13/18 (20060101); G02B 13/00 (20060101); G02B
9/60 (20060101) |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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2010224521 |
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Oct 2010 |
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JP |
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4947235 |
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Jun 2012 |
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JP |
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201135304 |
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Oct 2011 |
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TW |
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201250332 |
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Dec 2012 |
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TW |
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201317615 |
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May 2013 |
|
TW |
|
Primary Examiner: Nguyen; Thong
Attorney, Agent or Firm: Hsu; Winston Margo; Scott
Claims
What is claimed is:
1. An optical imaging lens set, from an object side toward an image
side in order along an optical axis comprising: a first lens
element, an aperture stop, a second lens element, a third lens
element, a fourth lens element and a fifth lens element, said first
to fifth lens elements having an object-side surface facing toward
the object side as well as an image-side surface facing toward the
image side, wherein: the first lens element has positive refractive
power, having a convex object-side surface with a convex part in a
vicinity of the optical axis and with a convex part in a vicinity
of its periphery; the second lens element has negative refractive
power, having an object-side surface with a convex part in a
vicinity of its periphery; the third lens element has positive
refractive power, having an object-side surface with a concave part
in a vicinity of its periphery; the fourth lens element has
positive refractive power, having an object-side surface with a
concave part in a vicinity of its periphery, and an image-side
surface with a convex part in a vicinity of the optical axis; and
the fifth lens element has an image-side surface with a concave
part in a vicinity of the optical axis, and a convex part in a
vicinity of its periphery; the optical imaging lens set does not
include any lens element with refractive power other than said
first lens element, second lens element, third lens element, fourth
lens element and fifth lens element, in addition, a thickness T1 of
said first lens element along said optical axis, a distance AG12
between the first lens element and the second lens element along
the optical axis, a distance AG45 between the fourth lens element
and the fifth lens element along the optical axis, a sum of all
four air gaps AAG between each lens element from said first lens
element to said fifth lens element along the optical axis, a
thickness T2 of said second lens element along said optical axis,
and a thickness T3 of said third lens element along said optical
axis satisfy the relationships AAG/T3.ltoreq.3.0,
0.9.ltoreq.T2/(AG12+AG45).ltoreq.2.0 and
2.0.ltoreq.T1/(AG12+AG45).ltoreq.4.0.
2. The optical imaging lens set of claim 1, wherein a distance BFL
between the image surface of the fifth lens element to an image
plane satisfies a relationship BFL/T1.ltoreq.3.3.
3. The optical imaging lens set of claim 2, wherein a thickness T5
of said fifth lens element along said optical axis satisfies a
relationship AAG/T5.ltoreq.2.5.
4. The optical imaging lens set of claim 2, wherein a thickness T5
of said fifth lens element along said optical axis, satisfies a
relationship 1.5.ltoreq.T5/(AG12+AG45).ltoreq.6.0.
5. The optical imaging lens set of claim 2, wherein further
satisfying a relationship
4.5.ltoreq.BFL/(AG12+AG45).ltoreq.12.0.
6. The optical imaging lens set of claim 1, wherein a distance BFL
between the image surface of the fifth lens element to an image
plane satisfies a relationship BFL/T2.ltoreq.6.6.
7. The optical imaging lens set of claim 1, wherein a thickness T4
of said fourth lens element along said optical axis satisfies a
relationship 1.0.ltoreq.T1/T4.ltoreq.1.8.
8. The optical imaging lens set of claim 1, wherein a distance AG23
between the second lens element and the third lens element along
the optical axis satisfies a relationship
0.65.ltoreq.T2/AG23.ltoreq.2.0.
9. The optical imaging lens set of claim 8, wherein further
satisfying a relationship AAG/T1.ltoreq.2.2.
10. The optical imaging lens set of claim 1, wherein a thickness T5
of said fifth lens element along said optical axis, and a distance
AG34 between the third lens element and the fourth lens element
along the optical axis satisfy a relationship
0.8.ltoreq.T5/AG34.ltoreq.2.5.
11. The optical imaging lens set of claim 10, wherein a distance
AG23 between the second lens element and the third lens element
along the optical axis satisfies a relationship
1.5.ltoreq.T1/AG23.ltoreq.3.5.
12. The optical imaging lens set of claim 11, wherein further
satisfying a relationship 0.9.ltoreq.T3/(AG12+AG45).ltoreq.2.0.
13. The optical imaging lens set of claim 1, wherein a thickness T4
of said fourth lens element along said optical axis, and a
thickness T5 of said fifth lens element along said optical axis
satisfy a relationship 0.9.ltoreq.T5/T4.ltoreq.2.5.
14. The optical imaging lens set of claim 13, wherein a total
thickness ALT of said first lens element, said second lens element,
said third lens element, said fourth lens element and said fifth
lens element along said optical axis, and a distance BFL between
the image surface of the fifth lens element to an image plane
satisfy a relationship 1.4.ltoreq.ALT/BFL.ltoreq.2.5.
15. The optical imaging lens set of claim 13, further satisfying a
relationship 0.75.ltoreq.T3/T4.ltoreq.1.5.
16. An electronic device, comprising: a case; and an image module
disposed in said case and comprising: an optical imaging lens set
of claim 1; a barrel for an installation of said optical imaging
lens set; a module housing unit for an installation of said barrel;
a substrate for an installation of said module housing unit; and an
image sensor disposed on the substrate and disposed at an image
side of said optical imaging lens set.
Description
CROSS REFERENCE TO RELATED APPLICATION
This application claims priority to Chinese Application No.
201410153384.0, filed on Apr. 16, 2014, the contents of which are
hereby incorporated by reference in their entirety for all
purposes.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to an optical imaging lens
set and an electronic device which includes such optical imaging
lens set. Specifically speaking, the present invention is directed
to an optical imaging lens set of five lens elements and an
electronic device which includes such optical imaging lens set of
five lens elements.
2. Description of the Prior Art
In recent years, the popularity of mobile phones and digital
cameras makes the sizes of various portable electronic products
reduce quickly, and so does the size of the photography modules.
The current trend of research is to develop an optical imaging lens
set of a shorter length with uncompromised good quality. The most
important characteristics of an optical imaging lens set are image
quality and size.
U.S. Pat. No. 7,480,105, U.S. Pat. No. 7,639,432, U.S. Pat. No.
7,486,449 and U.S. Pat. No. 7,684,127 disclose an optical imaging
lens set of five lens elements. However, in U.S. Pat. No. 7,480,105
and U.S. Pat. No. 7,639,432, the first lens element and the second
lens element have negative refractive power and with positive
refractive power respectively; in U.S. Pat. No. 7,486,449 and U.S.
Pat. No. 7,684,127, both the first lens element and the second lens
element have negative refractive power. This arrangement cannot
achieve good optical performance. Besides, in those four patents,
the total length of the optical imaging lens set is between
10.about.18 mm, and the size of the optical imaging lens set is too
big to satisfy the specification requirements of consumer
electronics products.
Therefore, how to reduce the total length of a photographic device,
but still maintain good optical performance, is an important
research objective.
SUMMARY OF THE INVENTION
In the light of the above, the present invention is capable of
proposing an optical imaging lens set that is lightweight, and has
a low production cost, reduced length, high resolution and high
image quality. The optical imaging lens set of five lens elements
of the present invention has a first lens element, an aperture
stop, a second lens element, a third lens element, a fourth lens
element and a fifth lens element sequentially from an object side
to an image side along an optical axis.
An optical imaging lens includes: a first, second, third, fourth
and fifth lens element, the first lens element has positive
refractive power, having an object-side surface with a convex part
in a vicinity of the optical axis, and a convex part in a vicinity
of its periphery; the second lens element has negative refractive
power, having an object-side surface with a convex part in a
vicinity of its periphery; the third lens element has positive
refractive power, having an object-side surface with a concave part
in a vicinity of its periphery; the fourth lens element has
positive refractive power, having an object-side surface with a
concave part in a vicinity of its periphery, and an image-side
surface with a convex part in a vicinity of the optical axis; the
fifth lens element has negative refractive power, having an
image-side surface with a concave part in a vicinity of the optical
axis and a convex part in a vicinity of its periphery, wherein the
optical imaging lens set does not include any lens element with
refractive power other than said first, second, third, fourth and
fifth lens elements.
In the optical imaging lens set of five lens elements of the
present invention, an air gap AG12 along the optical axis is
disposed between the first lens element and the second lens
element, an air gap AG23 along the optical axis is disposed between
the second lens element and the third lens element, an air gap AG34
along the optical axis is disposed between the third lens element
and the fourth lens element, an air gap AG45 along the optical axis
is disposed between the fourth lens element and the fifth lens
element, and the sum of total four air gaps between adjacent lens
elements from the first lens element to the fifth lens element
along the optical axis is AAG, AAG=AG12+AG23+AG34+AG45.
In the optical imaging lens set of five lens elements of the
present invention, the first lens element has a first lens element
thickness T1 along the optical axis, the second lens element has a
second lens element thickness T2 along the optical axis, the third
lens element has a third lens element thickness T3 along the
optical axis, the fourth lens element has a fourth lens element
thickness T4 along the optical axis, the fifth lens element has a
fifth lens element thickness T5 along the optical axis, and the
total thickness of all the lens elements in the optical imaging
lens set along the optical axis is ALT, ALT=T1+T2+T3+T4+T5. In
addition, the distance between the image-side surface of the fifth
lens element to an image plane along the optical axis is BFL (back
focal length). Besides, the total length of the optical imaging
lens set is TTL, in other words, the distance between the first
object-side surface of the first lens element to the image plane
along the optical axis is TTL.
In the optical imaging lens set of five lens elements of the
present invention, the relationship AAG/T3.ltoreq.3.0 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship BFL/T1.ltoreq.3.3 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship AAG/T5.ltoreq.2.5 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 1.5.ltoreq.T5/(AG12+AG45) is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 4.5.ltoreq.BFL/(AG12+AG45) is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 0.9.ltoreq.T2/(AG12+AG45) is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship BFL/T2.ltoreq.6.6 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 1.0.ltoreq.T1/T4 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 0.65.ltoreq.T2/AG23 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship AAG/T1.ltoreq.2.2 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 2.0.ltoreq.T1/(AG12+AG45) is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 0.8.ltoreq.T5/AG34 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 1.5.ltoreq.T1/AG23 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 0.9.ltoreq.T3/(AG12+AG45) is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 0.9.ltoreq.T5/T4 is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 1.4.ltoreq.ALT/BFL is
satisfied.
In the optical imaging lens set of five lens elements of the
present invention, the relationship 0.75.ltoreq.T3/T4 is
satisfied.
The present invention also proposes an electronic device which
includes the optical imaging lens set as described above. The
electronic device includes a case and an image module disposed in
the case. The image module includes an optical imaging lens set as
described above, a barrel for the installation of the optical
imaging lens set, a module housing unit for the installation of the
barrel, a substrate for the installation of the module housing
unit, and an image sensor disposed on the substrate and at an image
side of the optical imaging lens set.
These and other objectives of the present invention will no doubt
become obvious to those of ordinary skill in the art after reading
the following detailed description of the preferred embodiment that
is illustrated in the various figures and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a first example of the optical imaging lens set
of the present invention.
FIG. 2A illustrates the longitudinal spherical aberration on the
image plane of the first example.
FIG. 2B illustrates the astigmatic aberration on the sagittal
direction of the first example.
FIG. 2C illustrates the astigmatic aberration on the tangential
direction of the first example.
FIG. 2D illustrates the distortion aberration of the first
example.
FIG. 3 illustrates a second example of the optical imaging lens set
of five lens elements of the present invention.
FIG. 4A illustrates the longitudinal spherical aberration on the
image plane of the second example.
FIG. 4B illustrates the astigmatic aberration on the sagittal
direction of the second example.
FIG. 4C illustrates the astigmatic aberration on the tangential
direction of the second example.
FIG. 4D illustrates the distortion aberration of the second
example.
FIG. 5 illustrates a third example of the optical imaging lens set
of five lens elements of the present invention.
FIG. 6A illustrates the longitudinal spherical aberration on the
image plane of the third example.
FIG. 6B illustrates the astigmatic aberration on the sagittal
direction of the third example.
FIG. 6C illustrates the astigmatic aberration on the tangential
direction of the third example.
FIG. 6D illustrates the distortion aberration of the third
example.
FIG. 7 illustrates a fourth example of the optical imaging lens set
of five lens elements of the present invention.
FIG. 8A illustrates the longitudinal spherical aberration on the
image plane of the fourth example.
FIG. 8B illustrates the astigmatic aberration on the sagittal
direction of the fourth example.
FIG. 8C illustrates the astigmatic aberration on the tangential
direction of the fourth example.
FIG. 8D illustrates the distortion aberration of the fourth
example.
FIG. 9 illustrates a fifth example of the optical imaging lens set
of five lens elements of the present invention.
FIG. 10A illustrates the longitudinal spherical aberration on the
image plane of the fifth example.
FIG. 10B illustrates the astigmatic aberration on the sagittal
direction of the fifth example.
FIG. 10C illustrates the astigmatic aberration on the tangential
direction of the fifth example.
FIG. 10D illustrates the distortion aberration of the fifth
example.
FIG. 11 illustrates a sixth example of the optical imaging lens set
of five lens elements of the present invention.
FIG. 12A illustrates the longitudinal spherical aberration on the
image plane of the sixth example.
FIG. 12B illustrates the astigmatic aberration on the sagittal
direction of the sixth example.
FIG. 12C illustrates the astigmatic aberration on the tangential
direction of the sixth example.
FIG. 12D illustrates the distortion aberration of the sixth
example.
FIG. 13 illustrates a seventh example of the optical imaging lens
set of five lens elements of the present invention.
FIG. 14A illustrates the longitudinal spherical aberration on the
image plane of the seventh example.
FIG. 14B illustrates the astigmatic aberration on the sagittal
direction of the seventh example.
FIG. 14C illustrates the astigmatic aberration on the tangential
direction of the seventh example.
FIG. 14D illustrates the distortion aberration of the seventh
example.
FIG. 15 illustrates exemplificative shapes of the optical imaging
lens element of the present invention.
FIG. 16 illustrates a first preferred example of the portable
electronic device with an optical imaging lens set of the present
invention.
FIG. 17 illustrates a second preferred example of the portable
electronic device with an optical imaging lens set of the present
invention.
FIG. 18 shows the optical data of the first example of the optical
imaging lens set.
FIG. 19 shows the aspheric surface data of the first example.
FIG. 20 shows the optical data of the second example of the optical
imaging lens set.
FIG. 21 shows the aspheric surface data of the second example.
FIG. 22 shows the optical data of the third example of the optical
imaging lens set.
FIG. 23 shows the aspheric surface data of the third example.
FIG. 24 shows the optical data of the fourth example of the optical
imaging lens set.
FIG. 25 shows the aspheric surface data of the fourth example.
FIG. 26 shows the optical data of the fifth example of the optical
imaging lens set.
FIG. 27 shows the aspheric surface data of the fifth example.
FIG. 28 shows the optical data of the sixth example of the optical
imaging lens set.
FIG. 29 shows the aspheric surface data of the sixth example.
FIG. 30 shows the optical data of the seventh example of the
optical imaging lens set.
FIG. 31 shows the aspheric surface data of the seventh example.
FIG. 32 shows some important ratios in the examples.
DETAILED DESCRIPTION
Before the detailed description of the present invention, the first
thing to be noticed is that in the present invention, similar (not
necessarily identical) elements are labeled as the same numeral
references. In the entire present specification, "a certain lens
element has negative/positive refractive power" refers to the part
in a vicinity of the optical axis of the lens element has
negative/positive refractive power. "An object-side/image-side
surface of a certain lens element has a concave/convex part" refers
to the part is more concave/convex in a direction parallel with the
optical axis to be compared with an outer region next to the
region. Taking FIG. 15 for example, the optical axis is "I" and the
lens element is symmetrical with respect to the optical axis I. The
object side of the lens element has a convex part in the region A,
a concave part in the region B, and a convex part in the region C
because region A is more convex in a direction parallel with the
optical axis than an outer region (region B) next to region A,
region B is more concave than region C and region C is similarly
more convex than region E. "A circular periphery of a certain lens
element" refers to a circular periphery region of a surface on the
lens element for light to pass through, that is, region C in the
drawing. In the drawing, imaging light includes Lc (chief ray) and
Lm (marginal ray). "A vicinity of the optical axis" refers to an
optical axis region of a surface on the lens element for light to
pass through, that is, the region A in FIG. 15. In addition, the
lens element may include an extension part E for the lens element
to be installed in an optical imaging lens set. Ideally speaking,
no light would pass through the extension part, and the actual
structure and shape of the extension part is not limited to this
and may have other variations. For the reason of simplicity, the
extension part is not illustrated in FIGS. 1, 3, 5, 7, 9, 11 and
13.
As shown in FIG. 1, the optical imaging lens set 1 of five lens
elements of the present invention, sequentially from an object side
2 (where an object is located) to an image side 3 along an optical
axis 4, has a first lens element 10, an aperture stop 80, a second
lens element 20, a third lens element 30, a fourth lens element 40,
a fifth lens element 50, a filter 72 and an image plane 71.
Generally speaking, the first lens element 10, the second lens
element 20, the third lens element 30, the fourth lens element 40
and the fifth lens element 50 may be made of a transparent plastic
material and each has an appropriate refractive power, but the
present invention is not limited to this. There are exclusively
five lens elements with refractive power in the optical imaging
lens set 1 of the present invention. The optical axis 4 is the
optical axis of the entire optical imaging lens set 1, and the
optical axis of each of the lens elements coincides with the
optical axis of the optical imaging lens set 1.
Furthermore, the optical imaging lens set 1 includes an aperture
stop (ape. stop) 80 disposed in an appropriate position. In FIG. 1,
the aperture stop 80 is disposed between the first lens element 10
and the second lens element 20. When light emitted or reflected by
an object (not shown) which is located at the object side 2 enters
the optical imaging lens set 1 of the present invention, it forms a
clear and sharp image on the image plane 71 at the image side 3
after passing through the first lens element 10, the aperture stop
80, the second lens element 20, the third lens element 30, the
fourth lens element 40, the fifth lens element 50 and the filter
72.
In the embodiments of the present invention, the optional filter 72
may be a filter of various suitable functions, for example, the
filter 72 may be an infrared cut filter (IR cut filter), placed
between the fifth lens element 50 and the image plane 71.
Each lens element in the optical imaging lens set 1 of the present
invention has an object-side surface facing toward the object side
2 as well as an image-side surface facing toward the image side 3.
In addition, each object-side surface and image-side surface in the
optical imaging lens set 1 of the present invention has a part in a
vicinity of its circular periphery (circular periphery part) away
from the optical axis 4 as well as a part in a vicinity of the
optical axis (optical axis part) close to the optical axis 4. For
example, the first lens element 10 has a first object-side surface
11 and a first image-side surface 12; the second lens element 20
has a second object-side surface 21 and a second image-side surface
22; the third lens element 30 has a third object-side surface 31
and a third image-side surface 32; the fourth lens element 40 has a
fourth object-side surface 41 and a fourth image-side surface 42;
the fifth lens element 50 has a fifth object-side surface 51 and a
fifth image-side surface 52.
Each lens element in the optical imaging lens set 1 of the present
invention further has a central thickness on the optical axis 4.
For example, the first lens element 10 has a first lens element
thickness T1, the second lens element 20 has a second lens element
thickness T2, the third lens element 30 has a third lens element
thickness T3, the fourth lens element 40 has a fourth lens element
thickness T4, and the fifth lens element 50 has a fifth lens
element thickness T5. Therefore, the total thickness of all the
lens elements in the optical imaging lens set 1 along the optical
axis 4 is ALT, ALT=T1+T2+T3+T4+T5.
In addition, between two adjacent lens elements in the optical
imaging lens set 1 of the present invention there is an air gap
along the optical axis 4. For example, an air gap G12 is disposed
between the first lens element 10 and the second lens element 20,
an air gap G23 is disposed between the second lens element 20 and
the third lens element 30, an air gap G34 is disposed between the
third lens element 30 and the fourth lens element 40, and an air
gap G45 is disposed between the fourth lens element 40 and the
fifth lens element 50. Therefore, the sum of total four air gaps
between adjacent lens elements from the first lens element 10 to
the fifth lens element 50 along the optical axis 4 is AAG,
AAG=G12+G23+G34+G45.
Besides, the total length of the optical imaging lens set is TTL,
in other words, the distance between the first object-side surface
11 of the first lens element 10 to the image plane 71 along the
optical axis 4 is TTL; the distance between the fifth image-side
surface 52 of the fifth lens element 50 to the image plane 71 along
the optical axis 4 is BFL.
First Example
Please refer to FIG. 1 which illustrates the first example of the
optical imaging lens set 1 of the present invention. Please refer
to FIG. 2A for the longitudinal spherical aberration on the image
plane 71 of the first example; please refer to FIG. 2B for the
astigmatic field aberration on the sagittal direction; please refer
to FIG. 2C for the astigmatic field aberration on the tangential
direction, and please refer to FIG. 2D for the distortion
aberration. The Y axis of the spherical aberration in each example
is "field of view" for 1.0. The Y axis of the astigmatic field and
the distortion in each example stand for "image height", the image
height is 3.0 mm.
The optical imaging lens set 1 of the first example has five lens
elements 10,20,30,40 and 50, and all of the lens elements are made
of a plastic material and have refractive power. The optical
imaging lens set 1 also has an aperture stop 80, a filter 72, and
an image plane 71. The aperture stop 80 is provided between the
first lens element 10 and the second lens element 20. The filter 72
may be an infrared filter (IR cut filter) to prevent inevitable
infrared light from reaching the image plane to adversely affect
the imaging quality.
The first lens element 10 has positive refractive power. The first
object-side surface 11 facing toward the object side 2 is a convex
surface, having a convex part 13 in the vicinity of the optical
axis and a convex part 14 in a vicinity of its circular periphery;
The first image-side surface 12 facing toward the image side 3 is a
convex surface, having a convex part 16 in the vicinity of the
optical axis and a convex part 17 in a vicinity of its circular
periphery.
The second lens element 20 has negative refractive power. The
second object-side surface 21 facing toward the object side 2 has a
convex part 23 in the vicinity of the optical axis and a convex
part 24 in a vicinity of its circular periphery; The second
image-side surface 22 facing toward the image side 3 has a concave
part 26 in the vicinity of the optical axis and a concave part 27
in a vicinity of its circular periphery.
The third lens element 30 has positive refractive power. The third
object-side surface 31 facing toward the object side 2 has a convex
part 33 in the vicinity of the optical axis and a concave part 34
in a vicinity of its circular periphery; The third image-side
surface 32 facing toward the image side 3 is a convex surface,
having a convex part 36 in the vicinity of the optical axis and a
convex part 37 in a vicinity of its circular periphery.
The fourth lens element 40 has positive refractive power. The
fourth object-side surface 41 facing toward the object side 2 is a
concave surface, having a concave part 43 in the vicinity of the
optical axis and a concave part 44 in a vicinity of its circular
periphery; The fourth image-side surface 42 facing toward the image
side 3 is a convex surface, having a convex part 46 in the vicinity
of the optical axis and a convex part 47 in a vicinity of its
circular periphery.
The fifth lens element 50 has negative refractive power, a fifth
object-side surface 51 facing toward the object side 2 has a convex
part 53 in the vicinity of the optical axis and a concave part 54
in a vicinity of its circular periphery. The fifth image-side
surface 52 facing toward the image side 3 has a concave part 56 in
the vicinity of the optical axis and a convex part 57 in a vicinity
of its circular periphery. The filter 72 may be an infrared cut
filter, and is disposed between the fifth lens element 50 and the
image plane 71.
In the optical imaging lens element 1 of the present invention, the
object-side surfaces 11/21/31/41/51 and image-side surfaces
12/22/32/42/52 are all aspherical. These aspheric coefficients are
defined according to the following formula:
.function..times..times..times..times..times..times.
##EQU00001##
In which:
R represents the curvature radius of the lens element surface;
Z represents the depth of an aspherical surface (the perpendicular
distance between the point of the aspherical surface at a distance
Y from the optical axis and the tangent plane of the vertex on the
optical axis of the aspherical surface);
Y represents a vertical distance from a point on the aspherical
surface to the optical axis;
K is a conic constant; and
a2i is the aspheric coefficient of the 2i order.
The optical data of the first example of the optical imaging lens
set 1 are shown in FIG. 18 while the aspheric surface data are
shown in FIG. 19. In the present examples of the optical imaging
lens set, the f-number of the entire optical lens element system is
Fno, HFOV stands for the half field of view which is half of the
field of view of the entire optical lens element system, and the
unit for the curvature radius, the thickness and the focal length
is in millimeters (mm). The length of the optical imaging lens set
(the distance from the first object-side surface 11 of the first
lens element 10 to the image plane 71) is 4.950 mm. The image
height is 3.0 mm, HFOV is 37.51 degrees. Some important ratios of
this example are as follows:
AAG/T3=1.929
BFL/T1=2.170
T2/(AG12+AG45)=1.982
T2/AG23=1.586
T5/AG34=1.948
T5/T4=2.162
AAG/T5=0.926
T5/(AG12+AG45)=5.448
BFL/(AG12+AG45)=8.216
BFL/T2=4.145
T1/T4=1.503
AAG/T1=1.333
T1/(AG12+AG45)=3.787
T1/AG23=3.030
T3/(AG12+AG45)=1.982
ALT/BFL=1.990
T3/T4=1.038
Second Example
Please refer to FIG. 3 which illustrates the second example of the
optical imaging lens set 1 of the present invention. It is worth
noting that from the second example to the following examples, in
order to simplify the figures, only the components different from
what the first example has and the basic lens elements will be
labeled in figures. Others components that are the same as what the
first example has, such as the object-side surface, the image-side
surface, the part in the vicinity of the optical axis and the part
in a vicinity of its circular periphery will be omitted in the
following example. Please refer to FIG. 4A for the longitudinal
spherical aberration on the image plane 71 of the second example;
please refer to FIG. 4B for the astigmatic aberration on the
sagittal direction; please refer to FIG. 4C for the astigmatic
aberration on the tangential direction, and please refer to FIG. 4D
for the distortion aberration. The components in the second example
are similar to those in the first example, but the optical data
such as the curvature radius, the refractive power, the lens
thickness, the lens focal length, the aspheric surface or the back
focal length in this example are different from the optical data in
the first example. The optical data of the second example of the
optical imaging lens set are shown in FIG. 20 while the aspheric
surface data are shown in FIG. 21. The length of the optical
imaging lens set is 4.950 mm. The image height is 3.00 mm, HFOV is
37.52 degrees. Some important ratios of this example are as
follows:
AAG/T3=1.884
BFL/T1=2.166
T2/(AG12+AG45)=1.962
T2/AG23=1.555
T5/AG34=1.945
T5/T4=2.241
AAG/T5=0.927
T5/(AG12+AG45)=5.482
BFL/(AG12+AG45)=8.186
BFL/T2=4.171
T1/T4=1.545
AAG/T1=1.344
T1/(AG12+AG45)=3.779
T1/AG23=2.995
T3/(AG12+AG45)=1.962
ALT/BFL=1.999
T3/T4=1.102
Third Example
Please refer to FIG. 5 which illustrates the third example of the
optical imaging lens set 1 of the present invention. Please refer
to FIG. 6A for the longitudinal spherical aberration on the image
plane 71 of the third example; please refer to FIG. 6B for the
astigmatic aberration on the sagittal direction; please refer to
FIG. 6C for the astigmatic aberration on the tangential direction,
and please refer to FIG. 6D for the distortion aberration. The
components in the third example are similar to those in the first
example, but the optical data such as the curvature radius, the
refractive power, the lens thickness, the lens focal length, the
aspheric surface or the back focal length in this example are
different from the optical data in the first example, and in this
example, the first image-side surface 12 of the first lens element
10 is a concave surface, having a concave part 16A in a vicinity of
the optical axis, and a concave part 17A in a vicinity of its
circular periphery; the second object-side surface 21 of the second
lens element 20 has a convex part 23A in a vicinity of the optical
axis, and a concave part 24A in a vicinity of its circular
periphery; the third object-side surface 31 of the third lens
element 30 is a concave surface, having a concave part 33A in a
vicinity of the optical axis, and a concave part 34A in a vicinity
of its circular periphery. The optical data of the third example of
the optical imaging lens set are shown in FIG. 22 while the
aspheric surface data are shown in FIG. 23. The length of the
optical imaging lens set is 5.440 mm. The image height is 3.0 mm,
HFOV is 35.59 degrees. Some important ratios of this example are as
follows:
AAG/T3=2.917
BFL/T1=2.455
T2/(AG12+AG45)=1.166
T2/AG23=0.733
T5/AG34=1.751
T5/T4=1.565
AAG/T5=1.159
T5/(AG12+AG45)=4.403
BFL/(AG12+AG45)=7.654
BFL/T2=6.565
T1/T4=1.108
AAG/T1=1.637
T1/(AG12+AG45)=3.118
T1/AG23=1.961
T3/(AG12+AG45)=1.166
ALT/BFL=1.731
T3/T4=0.622
Fourth Example
Please refer to FIG. 7 which illustrates the fourth example of the
optical imaging lens set 1 of the present invention. Please refer
to FIG. 8A for the longitudinal spherical aberration on the image
plane 71 of the fourth example; please refer to FIG. 8B for the
astigmatic aberration on the sagittal direction; please refer to
FIG. 8C for the astigmatic aberration on the tangential direction,
and please refer to FIG. 8D for the distortion aberration. The
components in the fourth example are similar to those in the first
example, but the optical data such as the curvature radius, the
refractive power, the lens thickness, the lens focal length, the
aspheric surface or the back focal length in this example are
different from the optical data in the first example, and in this
example, the first image-side surface 12 of the first lens element
10 is a concave surface, having a concave part 16B in a vicinity of
the optical axis, and a concave part 17B in a vicinity of its
circular periphery; the third object-side surface 31 of the third
lens element 30 is a concave surface, having a concave part 33B in
a vicinity of the optical axis, and a concave part 34B in a
vicinity of its circular periphery. The optical data of the fourth
example of the optical imaging lens set are shown in FIG. 24 while
the aspheric surface data are shown in FIG. 25. The length of the
optical imaging lens set is 5.591 mm. The image height is 3.0 mm,
HFOV is 36.15 degrees. Some important ratios of this example are as
follows:
AAG/T3=1.652
BFL/T1=3.128
T2/(AG12+AG45)=1.522
T2/AG23=0.685
T5/AG34=1.522
T5/T4=1.085
AAG/T5=1.558
T5/(AG12+AG45)=3.574
BFL/(AG12+AG45)=10.765
BFL/T2=7.072
T1/T4=1.045
AAG/T1=1.618
T1/(AG12+AG45)=3.442
T1/AG23=1.550
T3/(AG12+AG45)=1.522
ALT/BFL=1.412
T3/T4=1.023
Fifth Example
Please refer to FIG. 9 which illustrates the fifth example of the
optical imaging lens set 1 of the present invention. Please refer
to FIG. 10A for the longitudinal spherical aberration on the image
plane 71 of the fifth example; please refer to FIG. 10B for the
astigmatic aberration on the sagittal direction; please refer to
FIG. 10C for the astigmatic aberration on the tangential direction,
and please refer to FIG. 10D for the distortion aberration. The
components in the fifth example are similar to those in the first
example, but the optical data such as the curvature radius, the
refractive power, the lens thickness, the lens focal length, the
aspheric surface or the back focal length in this example are
different from the optical data in the first example, and in this
example, the first image-side surface 12 of the first lens element
10 is a concave surface, having a concave part 16C in a vicinity of
the optical axis, and a concave part 17C in a vicinity of its
circular periphery; the third object-side surface 31 of the third
lens element 30 is a concave surface, having a concave part 33C in
a vicinity of the optical axis and a concave part 34C in a vicinity
of its circular periphery. The optical data of the fifth example of
the optical imaging lens set are shown in FIG. 26 while the
aspheric surface data are shown in FIG. 27. The length of the
optical imaging lens set is 5.417 mm. The image height is 3.0 mm,
HFOV is 35.91 degrees. Some important ratios of this example are as
follows:
AAG/T3=2.346
BFL/T1=2.209
T2/(AG12+AG45)=0.955
T2/AG23=0.704
T5/AG34=2.062
T5/T4=1.581
AAG/T5=1.127
T5/(AG12+AG45)=3.670
BFL/(AG12+AG45)=5.974
BFL/T2=6.253
T1/T4=1.165
AAG/T1=1.529
T1/(AG12+AG45)=2.705
T1/AG23=1.994
T3/(AG12+AG45)=0.955
ALT/BFL=1.911
T3/T4=0.759
Sixth Example
Please refer to FIG. 11 which illustrates the sixth example of the
optical imaging lens set 1 of the present invention. Please refer
to FIG. 12A for the longitudinal spherical aberration on the image
plane 71 of the sixth example; please refer to FIG. 12B for the
astigmatic aberration on the sagittal direction; please refer to
FIG. 12C for the astigmatic aberration on the tangential direction,
and please refer to FIG. 12D for the distortion aberration. The
components in the sixth example are similar to those in the first
example, but the optical data such as the curvature radius, the
refractive power, the lens thickness, the lens focal length, the
aspheric surface or the back focal length in this example are
different from the optical data in the first example, and in this
example, the second object-side surface 21 of the second lens
element 20 has a concave part 23D in a vicinity of the optical
axis, and a convex part 24D in a vicinity of its circular
periphery. The optical data of the sixth example of the optical
imaging lens set are shown in FIG. 28 while the aspheric surface
data are shown in FIG. 29. The length of the optical imaging lens
set is 5.083 mm. The image height is 3.0 mm, HFOV is 36.38 degrees.
Some important ratios of this example are as follows:
AAG/T3=2.414
BFL/T1=2.105
T2/(AG12+AG45)=0.912
T2/AG23=0.828
T5/AG34=0.874
T5/T4=0.900
AAG/T5=2.243
T5/(AG12+AG45)=1.913
BFL/(AG12+AG45)=5.326
BFL/T2=5.838
T1/T4=1.191
AAG/T1=1.697
T1/(AG12+AG45)=2.530
T1/AG23=2.295
T3/(AG12+AG45)=0.912
ALT/BFL=1.738
T3/T4=0.837
Seventh Example
Please refer to FIG. 13 which illustrates the seventh example of
the optical imaging lens set 1 of the present invention. Please
refer to FIG. 14A for the longitudinal spherical aberration on the
image plane 71 of the seventh example; please refer to FIG. 14B for
the astigmatic aberration on the sagittal direction; please refer
to FIG. 14C for the astigmatic aberration on the tangential
direction, and please refer to FIG. 14D for the distortion
aberration. The components in the seventh example are similar to
those in the first example, but the optical data such as the
curvature radius, the refractive power, the lens thickness, the
lens focal length, the aspheric surface or the back focal length in
this example are different from the optical data in the first
example, and in this example, the fourth image-side surface 42 of
the fourth lens element 40 has a convex part 46E in a vicinity of
the optical axis, and a concave part 47E in a vicinity of its
circular periphery. The optical data of the seventh example of the
optical imaging lens set are shown in FIG. 30 while the aspheric
surface data are shown in FIG. 31. The length of the optical
imaging lens set is 5.537 mm. The image height is 3.0 mm, HFOV is
36.12 degrees. Some important ratios of this example are as
follows:
AAG/T3=2.503
BFL/T1=2.274
T2/(AG12+AG45)=0.919
T2/AG23=0.688
T5/AG34=1.299
T5/T4=1.672
AAG/T5=1.572
T5/(AG12+AG45)=2.910
BFL/(AG12+AG45)=4.953
BFL/T2=5.393
T1/T4=1.251
AAG/T1=2.100
T1/(AG12+AG45)=2.178
T1/AG23=1.632
T3/(AG12+AG45)=0.919
ALT/BFL=1.933
T3/T4=1.050
Seventh Example
Please refer to FIG. 13 which illustrates the seventh example of
the optical imaging lens set 1 of the present invention. Please
refer to FIG. 14A for the longitudinal spherical aberration on the
image plane 71 of the seventh example; please refer to FIG. 14B for
the astigmatic aberration on the sagittal direction; please refer
to FIG. 14C for the astigmatic aberration on the tangential
direction, and please refer to FIG. 14D for the distortion
aberration. The components in the seventh example are similar to
those in the first example, but the optical data such as the
curvature radius, the refractive power, the lens thickness, the
lens focal length, the aspheric surface or the back focal length in
this example are different from the optical data in the first
example, and in this example, the fourth image-side surface 42 of
the fourth lens element 40 has a convex part 46E in a vicinity of
the optical axis, and a concave part 47E in a vicinity of its
circular periphery. The optical data of the seventh example of the
optical imaging lens set are shown in FIG. 30 while the aspheric
surface data are shown in FIG. 31. The length of the optical
imaging lens set is 5.537 mm. The image height is 3.0 mm, HFOV is
36.12 degrees. Some important ratios of this example are as
follows:
AAG/T3=2.503
BFL/T1=2.274
T2/(AG12+AG45)=0.919
T2/AG23=0.688
T5/AG34=1.299
T5/T4=1.672
AAG/T5=1.572
T5/(AG12+AG45)=2.910
BFL/(AG12+AG45)=4.953
BFL/T2=5.393
T1/T4=1.251
AAG/T1=2.100
T1/(AG12+AG45)=2.178
T1/AG23=1.632
T3/(AG12+AG45)=0.919
ALT/BFL=1.933
T3/T4=1.050
Some important ratios in each example are shown in FIG. 32.
The applicant summarized the efficacy of each embodiment mentioned
above as following:
1. In the present invention, the first lens element has positive
refractive power, to provide the needed refractive power for the
optical imaging lens set. The second lens element has negative
refractive power, to correct aberration; in addition, the third and
the fourth lens elements have positive refractive power, to
additional provide the needed refractive power for the optical
imaging lens set, and simplifying the difficulties in manufacturing
process.
2. The first object-side surface is a convex surface, helping to
collect the image light; the second object-side surface has a
concave part in the vicinity of its circular periphery; the third
object-side surface has a concave part in the vicinity of its
circular periphery; the fourth object-side surface has a concave
part in the vicinity of its circular periphery; the fourth
image-side surface has a convex part in the vicinity of the optical
axis; the fifth image-side surface has a concave part in the
vicinity of the optical axis and a convex part in the vicinity of
its circular periphery, these lens elements are matched to each
other, to ensure the image quality.
3. In addition, the inventors discover that there are some better
ratio ranges for different data according to the above various
important ratios. Better ratio ranges help the designers to design
the better optical performance and an effectively reduced length of
a practically possible optical imaging lens set. For example:
3.1 AAG/T3.ltoreq.3.0; AAG/T5.ltoreq.2.5; AAG/T1.ltoreq.2.2:
AAG is the sum of total four air gaps between adjacent lens
elements from the first lens element to the fifth lens element
along the optical axis. T1, T3 and T5 are the thickness of the
first lens element 10, the third lens element 30 and the fifth lens
element 50 along the optical axis 4 respectively. Decreasing those
parameters mentioned above can help for shrinking the total length
of the optical imaging lens set, but considering the difficulties
of during the manufacturing process, T1, T3 and T5 cannot be shrunk
effectively, but AAG can be shrunk compared with T1, T3 and T5.
Therefore, AAG/T3, AAG/T5 and AAG/T1 should preferably be small.
Preferably, AAG/T3 should be smaller than or equal to 3.0, ideally,
it is suggested that the range may be 1.0.about.3.0; AAG/T5 should
be smaller than or equal to 2.5, ideally, it is suggested that the
range may be 0.8.about.2.5; AAG/T1 should be smaller than or equal
to 2.2, ideally, it is suggested that the range may be
1.0.about.2.2.
3.2 T2/AG23.gtoreq.0.65; T5/AG34.gtoreq.0.8;
T1/AG23.gtoreq.1.5:
As mentioned above, the thickness cannot be shrunk effectively, so
the air gaps between every two adjacent lens elements should be
shrunk so as to decrease the total length of the optical imaging
lens set. Therefore, T2/AG23, T5/AG34 and T1/AG23 should preferably
be large. Preferably, T2/AG23 should be larger than or equal to
0.65, ideally, it is suggested that the range may be
0.65.about.2.0; T5/AG34 should be larger than or equal to 0.8,
ideally, it is suggested that the range may be 0.8.about.2.5;
T1/AG23 should be larger than or equal to 1.5, ideally, it is
suggested that the range may be 1.5.about.3.5.
3.3 T5/(AG12+AG45).gtoreq.1.5, BFL/(AG12+AG45).gtoreq.4.5,
T2/(AG12+AG45).gtoreq.0.9, T1/(AG12+AG45).gtoreq.2.0,
T3/(AG12+AG45).gtoreq.0.9:
As mentioned above, shrinking the air gaps between every two
adjacent lens elements can help to decrease the total length of the
optical imaging lens set. Therefore, T5/(AG12+AG45),
BFL/(AG12+AG45), T2/(AG12+AG45), T1/(AG12+AG45) and T3/(AG12+AG45)
should preferably be large. Preferably, T5/(AG12+AG45) should be
larger than or equal to 1.5, ideally, it is suggested that the
range may be 1.5.about.6.0; BFL/(AG12+AG45) should be larger than
or equal to 4.5, ideally, it is suggested that the range may be
4.5.about.12.0; T2/(AG12+AG45) should be larger than or equal to
0.9, ideally, it is suggested that the range may be 0.9.about.2.0;
T1/(AG12+AG45) should be larger than or equal to 2.0, ideally, it
is suggested that the range may be 2.0.about.4.0; T3/(AG12+AG45)
should be larger than or equal to 0.9, ideally, it is suggested
that the range may be 1.4.about.2.0.
3.4 BFL/T1.ltoreq.3.3, T5/T4.gtoreq.0.9, BFL/T2.ltoreq.6.6,
T1/T4.gtoreq.1.0, ALT/BFL.gtoreq.1.4, T3/T4.gtoreq.0.75:
T1-T5 are the central thickness of the first lens element 10 to the
fifth lens element 50 on the optical axis 4, BFL is the back focal
length of the optical imaging lens set, those parameters should be
maintained within a suitable value range. Otherwise, the total
length cannot be thinned if one lens element has too big central
thickness, or it's difficult to manufacture the optical imaging
lens set if one lens element has too small central thickness.
Preferably, BFL/T1 should be smaller than or equal to 3.3, ideally,
it is suggested that the range may be 1.5.about.3.3; T5/T4 should
be larger than or equal to 0.9, ideally, it is suggested that the
range may be 0.9.about.2.5; BFL/T2 should be smaller than or equal
to 6.6, ideally, it is suggested that the range may be
3.5.about.6.6; T1/T4 should be larger than or equal to 1.0,
ideally, it is suggested that the range may be 1.0.about.1.8;
ALT/BFL should be larger than or equal to 1.4, ideally, it is
suggested that the range may be 1.4.about.2.5; T3/T4 should be
larger than or equal to 0.75, ideally, it is suggested that the
range may be 0.75.about.1.5.
The optical imaging lens set 1 of the present invention may be
applied to a portable electronic device. Please refer to FIG. 16.
FIG. 16 illustrates a first preferred example of the optical
imaging lens set 1 of the present invention for use in a portable
electronic device 100. The portable electronic device 100 includes
a case 110, and an image module 120 mounted in the case 110. A
mobile phone is illustrated in FIG. 16 as an example, but the
portable electronic device 100 is not limited to a mobile
phone.
As shown in FIG. 16, the image module 120 includes the optical
imaging lens set 1 as described above. FIG. 16 illustrates the
aforementioned first example of the optical imaging lens set 1. In
addition, the portable electronic device 100 also contains a barrel
130 for the installation of the optical imaging lens set 1, a
module housing unit 140 for the installation of the barrel 130, a
substrate 172 for the installation of the module housing unit 140
and an image sensor 70 disposed at the substrate 172, and at the
image side 3 of the optical imaging lens set 1. The image sensor 70
in the optical imaging lens set 1 may be an electronic
photosensitive element, such as a charge coupled device or a
complementary metal oxide semiconductor element. The image plane 71
forms at the image sensor 70.
The image sensor 70 used here is a product of chip on board (COB)
package rather than a product of the conventional chip scale
package (CSP) so it is directly attached to the substrate 172, and
protective glass is not needed in front of the image sensor 70 in
the optical imaging lens set 1, but the present invention is not
limited to this.
To be noticed in particular, the optional filter 72 may be omitted
in other examples although the optional filter 72 is present in
this example. The case 110, the barrel 130, and/or the module
housing unit 140 may be a single element or consist of a plurality
of elements, but the present invention is not limited to this.
Each one of the five lens elements 10, 20, 30, 40 and 50 with
refractive power is installed in the barrel 130 with air gaps
disposed between two adjacent lens elements in an exemplary way.
The module housing unit 140 has a lens element housing 141, and an
image sensor housing 146 installed between the lens element housing
141 and the image sensor 70. However in other examples, the image
sensor housing 146 is optional. The barrel 130 is installed
coaxially along with the lens element housing 141 along the axis
I-I', and the barrel 130 is provided inside of the lens element
housing 141.
Please also refer to FIG. 17 for another application of the
aforementioned optical imaging lens set 1 in a portable electronic
device 200 in the second preferred example. The main differences
between the portable electronic device 200 in the second preferred
example and the portable electronic device 100 in the first
preferred example are: the lens element housing 141 has a first
seat element 142, a second seat element 143, a coil 144 and a
magnetic component 145. The first seat element 142 is for the
installation of the barrel 130, exteriorly attached to the barrel
130 and disposed along the axis I-I'. The second seat element 143
is disposed along the axis I-I' and surrounds the exterior of the
first seat element 142. The coil 144 is provided between the
outside of the first seat element 142 and the inside of the second
seat element 143. The magnetic component 145 is disposed between
the outside of the coil 144 and the inside of the second seat
element 143.
The first seat element 142 may pull the barrel 130 and the optical
imaging lens set 1 which is disposed inside of the barrel 130 to
move along the axis I-I', namely the optical axis 4 in FIG. 1. The
image sensor housing 146 is attached to the second seat element
143. The filter 72, such as an infrared filter, is installed at the
image sensor housing 146. Other details of the portable electronic
device 200 in the second preferred example are similar to those of
the portable electronic device 100 in the first preferred example
so they are not elaborated again.
Those skilled in the art will readily observe that numerous
modifications and alterations of the device and method may be made
while retaining the teachings of the invention. Accordingly, the
above disclosure should be construed as limited only by the metes
and bounds of the appended claims.
* * * * *